It's not likely, seeing as the only way he has used Chaos Powers is by use of the Chaos Emeralds. Remember, Shadow is a genetically altered clone of Sonic.
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It's pretty much up to your opinion. In most ways they are 'evenly matched' in the games, but in reality, Shadow technically is more powerful. Sonic just has speed going for him. Shadow on the other hand has: -Speed matching Sonic -Chaos Control *with only needing one chaos emerald mind you. Sonic can only do it when Super Sonic* -Chaos Control abilities like Chaos Spear, Chaos Blast, etc -Agility -And as far as we know Shadow doesn't run out of stamina as quickly as Sonic does. So again it's kinda up to you. They are 'evenly matched' in most ways, but Shadow does have more abilities end of story xP
Shadow can win if he have Chaos emeralds, in a fair fight, tails would whack him with ease by timing Shadow's speed attacks like in the comics.
Other than the extra abilities in several games like Sonic Unleashed, or Sonic Colors, Sonic doesn't 'gain' powers. He always had his famous speed. Along with the ability to use the chaos emeralds to turn into Super Sonic.
Yes, Silver The Hedgehog does have transformation when having together all the 7 Chaos Emerald into one place. This has been seen in Sonic The Hedgehog (2006) for PS3 and XBOX360. As you see Sonic, Shadow, Silver The Hedgehog, when they obtain the 7 Chaos Emeralds they will all transform into Super Sonic, Super Shadow, and Super Silver.
The chaos emeralds are very powerful and even more powerful together.Once all together Sonic and Shadow can turn into Super Sonic and Super Shadow.Sonic can also cause chaos control with all 7 emeralds,but Shadow only needs 1 emerald.That's why he kicks butt. I meant what they do apart like the lime green emerald waprs with chaos control i knew all this but well done anyways